On 08/23/2021 13:02, Wes Baden wrote:
Also, the AMSAT material that I received two years ago contemplated "The One True Rule," which seems to have disappeared unless I'm not seeing it on the air. Another return to the future? That is, holding a receive frequency and nudging transmit frequency around?
Your understanding of the "The One True Rule" is incorrect. In a perfect world you maintain the same frequency at the satellite. Doing so requires moving both your uplink and downlink frequency. In order to actually accomplish that, largely requires computerized doppler frequency management. When I first started (about 25 years ago), many of the most popular satellite radios had either no or very limited computer control of frequency. Therefore, the secondary version of doppler control was to adjust whichever frequency was on a higher band. In other words, if operating in mode V/U, the UHF receive would be adjusted, but if operating U/V, the UHF transmit would be adjusted.